Hypersomnolence refers to excessive daytime sleepiness; narcolepsy is a classic example.

• A. Insomnia
• B. Sleep apnea
• C. Narcolepsy
• D. Restless legs syndrome

Answer: (C)

Hypersomnolence is about excessive daytime sleepiness. Narcolepsy is a disorder where people experience persistent daytime sleepiness with sudden sleep attacks, making it a classic example of hypersomnolence. Insomnia centers on trouble sleeping at night, not daytime sleepiness. Sleep apnea involves breathing interruptions during sleep that fragment sleep and can lead to daytime sleepiness, but the defining issue is the breathing disruption rather than daytime sleepiness itself. Restless legs syndrome causes uncomfortable leg sensations and an urge to move at night, disrupting sleep but not primarily defined by daytime sleepiness. So narcolepsy best exemplifies hypersomnolence.